waifs awifs wiafs iwafs aiwfs iawfs wafis awfis wfais fwais afwis fawis wifas iwfas wfias fwias ifwas fiwas aifws iafws afiws faiws ifaws fiaws waisf awisf wiasf iwasf aiwsf iawsf wasif awsif wsaif swaif aswif sawif wisaf iwsaf wsiaf swiaf iswaf siwaf aiswf iaswf asiwf saiwf isawf siawf wafsi awfsi wfasi fwasi afwsi fawsi wasfi awsfi wsafi swafi aswfi sawfi wfsai fwsai wsfai swfai fswai sfwai afswi faswi asfwi safwi fsawi sfawi wifsa iwfsa wfisa fwisa ifwsa fiwsa wisfa iwsfa wsifa swifa iswfa siwfa wfsia fwsia wsfia swfia fswia sfwia ifswa fiswa isfwa sifwa fsiwa sfiwa aifsw iafsw afisw faisw ifasw fiasw aisfw iasfw asifw saifw isafw siafw afsiw fasiw asfiw safiw fsaiw sfaiw ifsaw fisaw isfaw sifaw fsiaw sfiaw
Note: these 'words' (valid or invalid) are all the permutations of the word waifs. These words are obtained by scrambling the letters in waifs.